[hackerrank] 삼각형 조건

https://www.hackerrank.com/challenges/what-type-of-triangle/problem?isFullScreen=true

삼각형의 정의를 이해하고 있어야함.

SELECT 
    CASE             
            WHEN A + B > C AND B + C > A AND A + C > B THEN
            CASE 
                WHEN (A=B AND B=C) THEN 'Equilateral'
                WHEN (A=B OR B=C OR A=C) THEN 'Isosceles'
                ELSE 'Scalene'
            END
            ELSE 'Not A Triangle'
    END
FROM TRIANGLES